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Technical

Information

Manual

Revision n. 4

20 April 2009

MOD. V 812 series

16 CH. CONSTANT

FRACTION

DISCRIMINATORS

NPO:

00101/97:V812x.MUTx/04

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Summary of Contents for V812

Page 1: ...Technical Information Manual Revision n 4 20 April 2009 MOD V 812 series 16 CH CONSTANT FRACTION DISCRIMINATORS NPO 00101 97 V812x MUTx 04 ...

Page 2: ... responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User It is strongly recommended to read thoroughly the CAEN User s Manual before any kind of operation CAEN reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice Disposal of the Product The product must never be dumpe...

Page 3: ... 11 2 4 1 INPUT connectors 11 2 4 2 OUTPUT connectors 11 2 5 OTHER COMPONENTS 12 2 5 1 Displays 12 2 5 2 Switches 12 2 5 3 Jumpers 12 3 VME INTERFACE 15 3 1 ADDRESSING CAPABILITY 15 3 2 DISCRIMINATOR THRESHOLDS 16 3 3 PATTERN OF INHIBIT 16 3 4 OUTPUT WIDTH CH 0 TO 7 AND CH 8 TO 15 16 3 5 DEAD TIME CH 0 TO 7 17 3 6 DEAD TIME CH 8 TO 15 17 3 7 MAJORITY THRESHOLD 17 3 8 TEST PULSE 17 3 9 MODULE IDENT...

Page 4: ...IGNAL 21 4 11 MAJORITY SETTING 22 LIST OF FIGURES FIG 1 1 MODEL TYPE LABEL EXAMPLE V812 B 6 FIG 1 2 BLOCK DIAGRAM 7 FIG 2 1 FRONT PANEL 10 FIG 2 2 COMPONENTS LOCATION 13 FIG 2 3 JUMPERS LOCATION 14 FIG 3 1 OUTPUT WIDTH VS REGISTER SET VALUE 16 FIG 3 2 MODULE IDENTIFIER WORDS 18 FIG 4 1 CURRENT SUM SIGNAL 21 FIG 4 2 EXAMPLE OF THREE DAISY CHAINED V812 23 LIST OF TABLES TABLE 1 1 VERSIONS AVAILABLE ...

Page 5: ... is 20 The constant fraction delay is defined by a delay line network of 20 ns with 5 taps see fig 2 2 The discriminator thresholds are settable via VME in a range from 1 mV to 255 mV 1 mV step through an 8 bit DAC The module can operate also with small below 10 mV input signals though in this case the Constant Fraction operation is not performed i e the walk is higher VETO and TEST inputs are ava...

Page 6: ...C 23 6 Table 1 1 Versions available for the Model V812 Version1 Number of channels PAUX connector2 V8123 16 yes V812 B 16 no Fig 1 1 Model type label example V812 B 1 A label on the printed board soldering side indicates the module s version see Fig 1 1 2 The version with the PAUX connector requires the V430 backplane 3 Available exclusively on request TYPE RIF N DATE MAY 5th 2002 WV812XBAAAAA ...

Page 7: ...age 00101 97 V812x MUTx 04 V812_REV4 DOC 23 7 1 2 Block diagram Fig 1 2 Block Diagram DACs TEST INHIBIT W LOGIC VME INTERFACE 8 bit DAC ch 0 8 bit 8 bit 8 bit ch 1 ch14 ch 15 THRESHOLDS discr INPUTS 0 15 test inhibit ch 0 ch 1 ch 14 ch 15 TEST VETO OUTPUTS 0 15 A B OR LED discr discr discr WIDTH AND OR OUT DEAD TIME Σ MAJ 8 bit DAC MAJ DAC DAC DAC VME BUS ...

Page 8: ... 110 Ω impedance Input output delay Set delay 4 5 2 ns Output width Programmable from 15 ns to 250 ns Dead Time Programmable from 150 ns to 2 μs 10 Max outputs time walk 400 ps for input signals in the range from 50 mV to 5 V with 25 ns rise time Autowalk Automatic adjustment of input offset and low frequency input noise of 40 mV Control inputs NIM logic signals high impedance VETO allows to veto ...

Page 9: ...ame Number of pages Page 00101 97 V812x MUTx 04 V812_REV4 DOC 23 9 2 Technical Specifications 2 1 Packaging The Mod V812 is housed in a 6U high 1U wide VME unit 2 2 Power requirements The power requirements of the Mod V812 are as follows Table 2 1 Power requirements V812 V812 B 12 V 100 mA 100 mA 12 V 60 mA 60 mA 5 V 1 A 5 5 A 5 V 3 A ...

Page 10: ...nel Constant Fraction Discriminator 20 04 2009 4 NPO Filename Number of pages Page 00101 97 V812x MUTx 04 V812_REV4 DOC 23 10 2 3 Front Panel Mod V812 CFD 16 CH 16 CH OR MAJ Σ I N 2 0 4 6 3 1 5 7 I N 12 14 10 8 13 15 11 9 DTK V E T O T E S T 8 0 15 7 OUT OUT Fig 2 1 Front Panel ...

Page 11: ...ge of the VETO signal must precede of at least 18 ns the leading edge of the input and overlap completely the input signal TEST INPUT Mechanical specifications 1 LEMO 00 type connectors Electrical specifications Standard NIM logic signal high impedance 8 ns minimum FWHM Max input frequency 30 MHz 2 4 2 OUTPUT connectors OUTPUT CHANNELS Mechanical specifications 4 Header 3M 3408 D202 type 8 8 pin c...

Page 12: ...ED Function VME selected it lights up during a VME access OR Type 1 green LED Function it lights up if at least one output signal is present 2 5 2 Switches ROTARY SWITCHES Function they allow to select module s VME address please refer to Fig 2 2 for their setting 2 5 3 Jumpers JP1 Function it allows to select the Majority logic Internal External please refer to Fig 2 3 for the jumper location on ...

Page 13: ...UX connector OR MAJ SUM Base address bit 23 20 Base address bit 19 16 Base address bit 31 28 Base address bit 27 24 Component side of the board Rotary switches for Base Address selection 0 8 4 C 3 B 1 9 A 2 7 F 5 D E 6 0 8 4 C 3 B 1 9 A 2 7 F 5 D E 6 0 8 4 C 3 B 1 9 A 2 7 F 5 D E 6 0 8 4 C 3 B 1 9 A 2 7 F 5 D E 6 Rotary switches for Base Address selection Discriminator Ch 14 Ch 15 Discriminator Ch...

Page 14: ...1 97 V812x MUTx 04 V812_REV4 DOC 23 14 Fig 2 3 Jumpers location VME P2 connector VME P1 connector VME PAUX connector JP1 max delay min delay piggy back board Internal CH 1 CH 3 CH 2 CH 5 CH 4 CH 7 CH 6 CH 9 CH 8 CH 11 CH 10 CH 13 CH 12 CH 15 CH 14 External JP 17 CH 0 JP 16 JP 15 JP 14 JP 13 JP 12 JP 11 JP 10 JP 9 JP 8 JP 7 JP 6 JP 5 JP 4 JP 3 JP 2 Components side ...

Page 15: ...Table 3 1 Address Map ADDRESS REGISTER CONTEN T TYPE Base 00 Base 02 Base 04 Base 06 Base 08 Base 0A Base 0C Base 0E Base 10 Base 12 Base 14 Base 16 Base 18 Base 1A Base 1C Base 1E Threshold register Ch 0 Threshold register Ch 1 Threshold register Ch 2 Threshold register Ch 3 Threshold register Ch 4 Threshold register Ch 5 Threshold register Ch 6 Threshold register Ch 7 Threshold register Ch 8 Thr...

Page 16: ...led 3 4 Output width Ch 0 to 7 and Ch 8 to 15 Base address 40 write only Base address 42 write only These registers contain the output pulse width value of the channels 0 through 7 and channels 8 through 15 respectively on a 8 bit words Thes values can be adjusted in the range from 15 ns to 250 ns writing an integer number between 0 and 255 into the registers The set value corresponds to the width...

Page 17: ...values 0 to 255 the Dead Time value between 150 ns and 2 μs The set value corresponds to the pulse width as follows 255 leads to a 2 μs value 0 leads to a 150 ns value N B the actual Dead Time is equal to the greater between output width and Dead Time set values 3 7 Majority threshold Base address 48 write only This register allows to set the Majority threshold between 1 and 16 for Internal Majori...

Page 18: ... l n u m b e r Base FE Address Base FC Base FA Manufacturer number M o d u l e t y p e F A F i x e d c o d e F 5 F i x e d c o d e Fig 3 2 Module Identifier Words At the address Base FA the two particular bytes allow the automatic localization of the module For the Mod V812 the word at the address Base FC has the following configuration Manufacturer N 000010 b Type of module 0001010001 b The word ...

Page 19: ...ut signals F Constant Fraction value The Mod V812 Constant Fraction Discriminator features a factory setting of 20 for the fraction and 20 ns for the full scale delay The delay can be selected in 4 ns steps up to 20 ns 4 2 Power ON Reset Status At Power ON the contents of all the module s registers are not determined A setting of the registers must be performed before any other operation 4 3 Setti...

Page 20: ...anel by performing a Write operation at Base address 4C 4 7 Setting the threshold For each channel of the V812 the discriminator threshold is set up via an 8 bit DAC The threshold values can be programmed in a range from 1 mV to 255 mV with 1 mV steps set values 1 to 255 As in all Constant Fraction Discriminators these thresholds are to be set above the noise level they do NOT correspond to the ac...

Page 21: ...nels 8 to 15 set values 0 to 255 The set value corresponds to the Dead Time as follows 255 leads to a 2 μs value 0 leads to a 150 ns value with a non linear interpolation for intermediate values N B The actual Dead Time is equal to the greater between Output Width and Dead Time set 4 10 Current Sum signal The front panel also houses the Current Sum Σ output connector which provides a current propo...

Page 22: ...l to an External position by means of an internal Jumper see Fig 2 3 Internal With the jumper on the Internal position Majority output provides an active signal if the number of the active channels of the module exceeds the programmed majority level MAJLEV In this case valid values of MAJLEV are from 1 to 16 External Several modules can be connected in daisy chain via the Σ outputs In this case by...

Page 23: ...channels Number of Module s active Channels 5 4 3 Majority Output ACTIVE 5 MAJLEV NON Active 4 MAJLEV ACTIVE 5 4 3 MAJLEV Fig 4 2 Example of three daisy chained V812 12 mA 2 3 1 Maj State EXT Maj State INT 50 ohm Maj State INT Mod V895 LTD 16 CH 16 CH OR MAJ Σ I N 2 0 4 6 3 1 5 7 I N 12 14 10 8 13 15 11 9 DTK V E T O T E S T 0 7 OUT OUT 8 15 Mod V895 LTD 16 CH 16 CH OR MAJ Σ I N 2 0 4 6 3 1 5 7 I ...

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